Grilled Portobello and Cheese Burgers

Name: Grilled Portobello and Cheese Burgers
Ingredients: 2 tsp. dried Italian seasoning; 1/3 cup plus 1 Tbsp. sherry vinegar, divided; 6 Tbsp. extra-virgin olive oil, divided, plus more for brushing; 4 tsp. finely chopped garlic (from about 4 cloves), divided; 6 3 1/2-oz. portobello mushroom caps, stemmed; 1/4 cup salted roasted almonds; 1/4 cup drained sun-dried tomatoes in oil; 1/4 cup drained jarred roasted red bell peppers, plus liquid from jar; 1/8 tsp. kosher salt; Neutral oil (such as canola); 1 20-oz. pkg. part-skim panela cheese (such as La Chona) or paneer; 1/2 cup labneh or sour cream; 6 burger buns, toasted; 1 1/2 cups lightly packed baby arugula